21653352242256 has 40 divisors (see below), whose sum is σ = 63928944716224. Its totient is φ = 6186672069120.

The previous prime is 21653352242237. The next prime is 21653352242311. The reversal of 21653352242256 is 65224225335612.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32222250025 + ... + 32222250696.

Almost surely, 2^{21653352242256} is an apocalyptic number.

It is an amenable number.

21653352242256 is an abundant number, since it is smaller than the sum of its proper divisors (42275592473968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21653352242256 is a wasteful number, since it uses less digits than its factorization.

21653352242256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64444500739 (or 64444500733 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 48.

Adding to 21653352242256 its reverse (65224225335612), we get a palindrome (86877577577868).

The spelling of 21653352242256 in words is "twenty-one trillion, six hundred fifty-three billion, three hundred fifty-two million, two hundred forty-two thousand, two hundred fifty-six".